struct mapper_004_0 {
	uint8_t *prg_banks[4];		// 8kb banks at $8000, $a000, $c000, $e000
	uint8_t *chr_banks[8];		// 1kb banks at $0000-$1fff

	uint8_t bank_select;
	uint8_t bank_registers[8];
	uint8_t mirroring;

	uint8_t irq_latch;
	uint8_t irq_counter;
	uint8_t irq_reload;
	uint8_t irq_enabled;

	uint8_t last_a12;
} __attribute__((packed, aligned(64)));